Kudos for avoiding sanction reports. In my personal opinion, it is very rare that sanction reports are actually needed. I'm all for trying to reason out your differences with the other player in pm, or if nothing else tell them what you feel they did wrong. If they flame you, that's that, do what you feel is necessary, but often times they are willing to give you their side in a somewhat reasonable manner. If you still can't agree, move on. Sanction reports should only be used if the other person's actions are severely inhibiting gameplay, not just your enjoyment.